Olive oil wasn’t discovered in a single moment. It emerged gradually over thousands of years as people in the eastern Mediterranean learned to harvest wild olive trees, crush their fruit, and separate the oil. The oldest confirmed olive oil residue, found in clay pots at Ein Zippori in northern Israel, dates to roughly 5800 BCE, making it about 8,000 years old. But the story begins even earlier, with people gathering wild olives from trees that grew naturally along the coastline of what is now Israel and Lebanon.
Wild Olives and the First Oil
Long before anyone planted an olive tree on purpose, people collected fruit from wild olive trees called oleasters. These wild trees still grow across the Mediterranean today, but their fruit is small, less fleshy, and contains far less oil than the cultivated varieties we know. Archaeological evidence from the submerged site of Kfar Samir, on Israel’s Mediterranean coast, tells the story: thousands of crushed olive pits dating to roughly 7,600 to 7,000 years ago show that people were processing olives in large quantities. The pit shapes match wild olive populations that still grow nearby, meaning these early producers were foraging, not farming.
At some point, people noticed that crushing olives released a rich, fragrant liquid. The earliest method was about as simple as you’d expect. Heavy rocks pressed down directly on olive pulp. Stone rollers crushed fruit in troughs made of wood or stone. On the island of Corsica, structures dating to around 5000 to 4000 BCE suggest people squeezed olives into sacks fixed to pegs to drain the oil. People also treaded olives with their feet, much like grapes for wine. These techniques produced small quantities, but they worked.
From Foraging to Farming
The transition from gathering wild olives to deliberately cultivating them happened in the southern Levant, the coastal region stretching from modern-day Israel through Lebanon and Syria. Pollen records and archaeological findings point to this area as the center of initial olive cultivation, beginning around 6,500 years ago. From there, the practice spread to other parts of the Mediterranean.
Domestication changed the olive tree dramatically. Through generations of selective planting, people bred trees that produced larger fruit with thicker, oilier flesh. Wild oleasters can take several decades to mature, but cultivated varieties were selected to bear fruit faster. Genetic analysis shows that cultivated olives have significantly less genetic diversity than their wild cousins, a clear fingerprint of intensive selective breeding over centuries.
More Than Food
What makes olive oil’s discovery so significant is that people quickly found it useful for far more than eating. In the ancient Mediterranean, olive oil became the primary fuel for oil lamps, providing light after dark for households, temples, and public spaces. It served as soap, perfume, and a base for cosmetics. In ancient Greece, athletes rubbed it over their bodies before competition. It was used to anoint the dead. Homer reportedly called it “liquid gold,” and Hippocrates, the foundational figure of Western medicine, called it “the great healer.” The Roman physician Galen praised its positive effects on health. Olive oil wasn’t just a food product. It was a pillar of daily life.
How It Became a Trade Commodity
For thousands of years, olive oil production stayed relatively small scale, with individual households pressing enough for their own needs. That changed on the island of Crete. During the Minoan civilization’s palace period, roughly 1700 to 1450 BCE, olive oil production shifted from household activity to something more industrial. Large-scale pressing stations were built within settlements, suggesting a move toward communal processing designed to create surplus. This was olive oil made not just for personal use but for export.
The Minoans even invented a new type of vessel to make shipping possible: the transport stirrup jar, a sturdy container designed specifically for moving liquids over long distances by sea. These jars have been found in large numbers at port cities across the eastern Mediterranean, including sites in modern-day Israel and Syria. Archaeological evidence shows that olive oil was bottled and shipped to different areas of the Mediterranean, making it one of the ancient world’s first major trade commodities.
Spreading Across the Mediterranean
For a long time, historians assumed that Greek and Phoenician colonists were responsible for bringing olive cultivation to places like Italy and Spain. Recent research has complicated that picture. In Italy, olives were part of daily life for at least 6,000 years, longer than previously thought and predating Greek colonization. Local populations were already cultivating olives and producing oil on their own. What Greek and Phoenician traders brought was not the olive itself but new knowledge, technology, and production techniques that accelerated and intensified cultivation that was already underway.
This pattern of cultural exchange through trade and colonization created opportunities for local innovation. Different regions developed their own pressing techniques, their own preferred varieties, and eventually their own regional oil traditions. The Romans later industrialized olive oil production even further, developing complex lever presses driven by winch or screw systems that could process far greater volumes than the stone-and-muscle methods of earlier centuries. Wooden wedge systems and vertical pressure devices gave producers increasingly efficient ways to extract every drop of oil from the fruit.
A Discovery That Took Millennia
The discovery of olive oil was less a single breakthrough and more a slow accumulation of knowledge. Someone along the ancient Levantine coast first noticed that crushed wild olives released a useful liquid. Over centuries, people refined their methods, from smashing fruit with rocks to engineering mechanical presses. They selected trees that produced more oil. They found uses for the product that went far beyond cooking. And eventually, they built trade networks to move it across the sea. The 8,000-year-old oil residue found at Ein Zippori was so well preserved that researchers found a strong resemblance to modern olive oil, a reminder that the fundamental chemistry of the product has barely changed since the Stone Age, even as the scale of its production transformed the ancient world.